问一道英文数学题,what is the present value of the following?$845 perpetuity discounted back to the present at 18%

问一道英文数学题,what is the present value of the following?$845 perpetuity discounted back to the present at 18% 一道英文版的数学题,What is sum of the multiples of 3 between 3 and 999,inclusive? 问一道新加坡数学题：全英文的.Given the map distance is 400m,the actual distance is 360% of the map distancefind the map scale.The answer is 1m：4m.and don't know what's the meaning of 360% 谁帮我解一道英文的数学题the ratio of Stan`s age to Fred`s age is 7:12.in 3 year time,their total age will be 101.what is Fred age 17 years from now 一道sat数学题 tx+12y=-3 t is a constant ,if the slope of the line is -10,what the value of 一道英文数学题(微积分)The dimensions of a rectangle are changing in such a way that the area remains 24 in^2.At what rate is the perimeter changing at the instant when one side is 6 in,long and is increasing at the rate of 0.3 inch per minu 一道数学题,第三问 问一道数学题 不难 我想问一道数学题? 一道数学题.第二问 问一道大学数学题 问一道数学题 急 问一道微积分数学题 问一道国外数学题! 问一道数学题, 问一道数学题撒. 问一道用英语出的数学题!急!if the width of a rectangle is increased by 25% while the length remains constant ,the resulting area is what percent of the orginal area? 第二道：Mr jones can mow his lawn in x hours .After 2 hours ,it begin 一道英文的数学题…… 没看懂A child swings back and forth,reaching a maximum angle of 32° with the vertical.The swing is 3.4 m long and 0.75 m from the ground when at rest.What maximum height above the ground does the child reach.“The